# Published Articles

## Articles in refereed journals and volumes

"Necessary Gradient Restrictions at the Core of a Voting Rule" (2018) This paper strengthens known gradient restrictions for the core of a voting rule. For the special case of majority rule with an even number of voters, it implies that if a core point is the ideal point of one voter, then for every pair of voters whose gradients do not point in opposite directions, there is a third voter whose gradient is semi-positively dependent with the gradients of the first two. A difficulty in the proof of a result by Schofield (1983) is identified, and a counterexample is presented. *Journal of Mathematical Economics, *forthcoming.

"Weak Rationalizability and Arrovian Impossibility Results for Responsive Social Choice" (2018) I give representation theorems for choice functions satisfying weak rationality conditions, and I use these to deduce impossibility theorems for preference aggregation satisfying responsiveness conditions along with weak (or no!) rationality conditions. *Public Choice*, forthcoming.

“Directional Equilibria” (2018) with Hun Chung. We propose a new solution concept (directional equilibrium) for the multidimensional spatial model. We establish connections the core, Pareto optimality, existence, and generic local uniqueness and stability, and we provide non-cooperative foundations. The main update is a generalization of Theorem 1, which shows that if an alternative belongs to the majority core, then it is a directional equilibrium; the proof uses the gradient restriction provided in "Necessary Gradient Restrictions at the Core of a Voting Rule." Here is the last version before publication; here is a working paper with results on generic properties; here are some slides from a longer talk; and here are slides from a shorter talk. *Journal of Theoretical Politics,* 30: 272--305.

"Existence and Indeterminacy of Markovian Equilibria in Dynamic Bargaining Games" (2018) with Vincent Anesi. We show that if certain gradient restrictions hold at an alternative, then when players are sufficiently patient, there is a continuum of equilibria with absorbing sets arbitrarily close to that alternative. Here is a longer working paper with a result that delivers a continuum of Pareto efficient equilibria. Here are some slides from a talk. *Theoretical Economics*, 13: 505--525.

“The Political Economy of Dynamic Elections: Accountability, Commitment, and Responsiveness” (2017) with Cesar Martinelli. This paper contains a survey and synthesis of the literature on electoral accountability, i.e., repeated elections in which politicians cannot commit their policy choices. We establish sets of conditions under which policy choices nevertheless reflect the preferences of the median voter. Here is the latest version before publication. Here is a working paper that contains proofs omitted from the shorter paper. *Journal of Economic Literature*, 55: 916--984.

“Term Limits and Bounds on Policy Responsiveness in Dynamic Elections” (2017) I examine the possibility of policy responsiveness in an infinite-horizon model of elections with a two-period term limit, under the assumption of adverse selection and moral hazard. I characterize equilibria and prove existence of equilibrium, pointing out and correcting an error in the proof of Banks and Sundaram (1998). The current version contains corrections of many errors in the previous version. Here are some slides from a talk. *Journal of Economic Theory*, 170: 426--463.

“Dynamic Bargaining and Stability with Veto Players” (2017) with Vincent Anesi. We establish ergodic properties of equilibria in the finite environment of Anesi (2012), and we show that when players are patient and the voting rule is oligarchical, a set is a von Neumann-Morgenstern solution if and only if it consists of the absorbing points of an equilibrium. We also establish this result in the model with general voting rule and a persistent agenda setter. *Games and Economic Behavior, *103: 30--40.

“Existence of Stationary Bargaining Equilibria” (2017) An existence theorem for stationary equilibria in a general class of bargaining models assuming only continuity and compactness conditions -- no convexity or comprehensiveness assumptions are used. This is a revision of the paper formerly known as “Coalitional Bargaining Equilibria”. Here are some slides from a shorter talk that was pretty good. Here are some slides from a longer talk that was probably less clear. *Games and Economic Behavior, *102: 111--126.

“May’s Theorem in One Dimension” (2017) I provide characterizations of majority rule using the axioms of Kenneth May, but assuming single-peaked preferences and substituting transitivity properties for the more controversial positive responsiveness axiom. *Journal of Theoretical Politics,*29: 3--21.

"Limits of Acyclic Voting" (2016) An Arrovian result for acyclic social choice under the independence of irrelevant alternatives. This is an abbreviated version of “Limits of Acyclic Voting and Nash Implementation,” less the implementation result, plus results for saturated domains, large numbers of alternatives, and a version of acyclicity that precludes cycles of an arbitrary, fixed length. Here is a version of “Limits of Acyclic Voting and Nash Implementation" with cool, throwback type setting. *Journal of Economic Theory*, 163: 658--683.

“Purification of Bayes Nash Equilibrium with Correlated Types and Interdependent Payoffs” (2015) with Paulo Barelli. Here are some slides from a talk. *Games and Economic Behavior,* 94: 1--14.

“Preference Exclusions for Social Rationality” (2015) I provide conditions for transitive and acyclic voting under general preference restrictions, and I extend known results for value restriction, single peakedness, weak single peakedness, and order restriction. For median voter theorems and representative voter theorems, see my unpublished paper, “Value Restriction, Median Voters, and the Core.” *Social Choice and Welfare*, 46: 93--118.

“A Folk Theorem for the One-dimensional Spatial Bargaining Model” (2015) with Seok ju Cho, *International Journal of Game Theory,* 44: 933--948.

“Extremal Choice Equilibrium with Applications to Large Games, Stochastic Games, and Endogenous Institutions” (2015) with Paulo Barelli, *Journal of Economic Theory,* 155: 95--130.

“A Folk Theorem for Repeated Elections with Adverse Selection” (2014) *Political Science Research and Methods,* 2: 213-242. Here are some slides from a talk.

“A Note on Semi-Markov Perfect Equilibria in Discounted Stochastic Games” (2014) with Paulo Barelli, *Journal of Economic Theory,* 151: 596--604.

“Majority Voting Over Lotteries: Conditions for Existence of a Decisive Voter” (2014) *Economics Bulletin,* 34: 263--270.

"Uncovered Sets" (2013) *Social Choice and Welfare,* 41: 489--535.

"Noisy Stochastic Games" (2012) *Econometrica*, 80: 2017--2045. Here are some slides from a talk.

"Dynamic Legislative Policy Making" (2012) with Tasos Kalandrakis, *Journal of Economic Theory*, 147: 1653--1688. Here is the last version prior to publication. Here are slides from a talk that mainly focusses on existence and properties of equilibrium, and here are some slides from a talk specifically on our core convergence result.

"General Conditions for Existence of Maximal Elements via the Uncovered Set" (2011) *Journal of Mathematical Economics*, 47: 755--759. Here is the last version prior to publication.

"A Spatial Theory of Media Slant and Voter Choice" (2011) with Cesar Martinelli, *Review of Economic Studies*, 78: 640--666.

"A Newton Collocation Method for Solving Dynamic Bargaining Games" (2011) with Tasos Kalandrakis, *Social Choice and Welfare*, 36: 611--650. Here is the last version prior to publication.

"The Case for Responsible Parties" (2009) with Dan Bernhardt and Francesco Squintani, *American Political Science Review*, 103: 570--587. Here is the last version prior to publication. Here are some slides from a talk. Also, check out this presentation in real time.

"Voting Equilibria in Multicandidate Elections" (2009) with Yoji Sekiya, *Journal of Public Economic Theory,* 11: 875--889. Here is the last version prior to publication.

"Private Polling in Elections and Voter Welfare" (2009) with Dan Bernhardt and Francesco Squintani, *Journal of Economic Theory,* 144: 2021--2056. Here is the final version prior to publication.

"Bargaining Foundations of the Median Voter Theorem" (2009) with Seok-ju Cho, *Journal of Economic Theory,* 144: 851--868. Here is the final version prior to publication. Here is a working paper that allows for an even number of voters and heterogeneous discount factors. Here are some slides from a short seminar, here are some slides from a longer presentation at the Wallis conference, and here are some detailed slides.

"A Dynamic Model of Democratic Elections in Multidimensional Policy Spaces" (2008) with Jeff Banks, *Quarterly Journal of Political Science,* 3: 269--299. This is my last published paper with Jeff.

"Dynamics of the Presidential Veto: A Computational Analysis" (2008) with Tasos Kalandrakis and Vikram Manjunath, *Mathematical and Computer Modelling,* 48: 1570--1589. Here is the final version of the paper prior to publication.

"Equilibrium Existence for Zero-sum Games and Spatial Models of Elections" (2007) *Games and Economic Behavior,* 60: 52--74. Here is the final version prior to publication.

"Electoral Competition with Privately Informed Candidates" (2007) with Dan Bernhardt and Francesco Squintani, *Games and Economic Behavior,* 58: 1--29. Here is the last version prior to publication. For a more general, somewhat less readable version of the paper, click here. Here are some slides from a talk.

"A Systematic Procedure for the Construction of Non-empty Choice Sets" (2007) *Social Choice and Welfare,* 28: 491--506. Here is the last version prior to publication.

"Endogenous Voting Agendas" (2006) *Social Choice and Welfare,* 27: 495--530. Here is the final version prior to publication.

"Repeated Downsian Electoral Competition" (2006) with Mark Fey, *International Journal of Game Theory,* 35: 39--69. Here is the last version prior to publication.

"A Social Choice Lemma on Voting Over Lotteries" (2006) with Jeff Banks, *Social Choice and Welfare,* 26: 285--304. Here is the last version prior to publication.

"A Note on Uniqueness of Electoral Equilibrium When the Median Voter Is Unobserved" (2006) *Economics Letters*, 92: 240--244. Here is the last version prior to publication.

"A General Bargaining Model of Legislative Policy-making" (2006) with Jeff Banks, *Quarterly Journal of Political Science,* 1: 49--85.

"Social Choice and Electoral Competition in the General Spatial Model" (2006) with Jeff Banks and Michel Le Breton, *Journal of Economic Theory,* 126: 194--234. Here is the last version prior to publication.

"Candidate Objectives and Electoral Equilibrium" (2006) in *The Oxford Handbook of Political Economy*, Barry Weingast and Donald Wittman, eds., Oxford: Oxford University Press.

“Probabilistic Voting in the Spatial Model of Elections: The Theory of Office-Motivated Candidates” (2005) in *Social Choice and Strategic Decisions: Essays in Honor of Jeffrey S. Banks,*David Austen-Smith and John Duggan, eds., New York: Springer. Here is the last version prior to publication.

"Electoral Competition with Policy-Motivated Candidates" (2005) with Mark Fey, *Games and Economic Behavior,* 51: 490--522. Here is the last version prior to publication. Here are some slides from a talk.

"Uniqueness of Stationary Equilibria in a One-dimensional Model of Bargaining" (2003) with Seok-ju Cho, *Journal of Economic Theory,* 113: 118--130. Here is the last version prior to publication.

"Nash Implementation with a Private Good" (2002) *Economic Theory,* 21: 117--131. Here is the last version prior to publication.

"Implementing the Efficient Allocation of Pollution" (2002) with Joanne Roberts, *American Economic Review,* 92: 1070--1078. Here is the last version prior to publication, and here is a version that includes an analysis of the model with incomplete information.

"Bounds for Mixed Strategy Equilibria and the Spatial Model of Elections" (2002) with Jeff Banks and Michel Le Breton, *Journal of Economic Theory,* 103: 88--105. Here is the last version prior to publication.

"A Bayesian Model of Voting in Juries" (2001) with Cesar Martinelli, *Games and Economic Behavior,* 37: 259--294. Here is the last version prior to publication.

"Mixed Refinements of Shapley's Saddles and Weak Tournaments" (2001) with Michel Le Breton, *Social Choice and Welfare,* 8: 65--78. Here is CORE Discussion Paper no. 9921, which contains more material on weak tournaments and rationalizable sets.

"Repeated Elections with Asymmetric Information" (2000) *Economics and Politics,* 12: 109--136. Here is the last version prior to publication. Here are some slides from a talk.

"A Bargaining Model of Collective Choice" (2000) with Jeff Banks, *American Political Science Review,* 94: 73--88. Here is an unpublished version that contains an appendix showing that our assumption of "limited shared weak preference" is satisfied in a variety of economic environments.

"Strategic Manipulability without Resoluteness or Shared Beliefs: Gibbard-Satterthwaite Generalized" (2000) with Tom Schwartz, *Social Choice and Welfare,* 17: 85--93. Here is the last version prior to publication, and here is Caltech Social Science Working Paper no. 817, which contains a version of our result with a stronger range condition and weaker non-dictatorship condition.

"A General Extension Theorem for Binary Relations" (1999) *Journal of Economic Theory,* 86: 1--16. Here is the last version prior to publication.

"An Implementation-theoretic Approach to Non-cooperative Foundations" (1999) with Jim Bergin, *Journal of Economic Theory,* 86: 50--76.

"An Extensive Form Solution to the Adverse Selection Problem in Principal/ Multi-agent Environments" (1998) *Review of Economic Design,* 3: 167--191. Here is the last version prior to publication.

"Virtual Bayesian Implementation" (1997) *Econometrica*, 65: 1175--1199. Here is the last version prior to publication. Here are some slides from a talk.

"Hansson's Theorem for Generalized Social Welfare Functions: An Extension" (1997) *Social Choice and Welfare,* 14: 471--478. Here is the last version prior to publication.

"Dutta's Minimal Covering Set and Shapley's Saddles" (1996) with Michel Le Breton, *Journal of Economic Theory,* 70: 257--265. Here is the last version prior to publication.

"Arrow's Theorem in Public Good Environments with Convex Production Technologies" (1996) *Journal of Economic Theory,* 68: 303--318.

"A Geometric Proof of Gibbard's Random Dictatorship Theorem" (1996) *Economic Theory,* 7: 365--369.

"Functional Voting Operators: The Non-monotonic Case" (1993) with Fuad Aleskerov, *Mathematical Social Sciences,* 26: 175--201.